(function(win, doc) {
				//浏览器缩放时
				win.onresize = function() {
					change();
				};
				change();
			
			
				function change() {
					var oFs = doc.documentElement.clientWidth / (320 / 20);
			
			
					//设置根目录字体大小
					doc.documentElement.style.fontSize = oFs + 'px';
				}
})(window, document);